2 research outputs found
Probing axion-like particles with final states from vector boson fusion processes at the LHC
We perform a feasibility study to search for axion-like particles (ALPs)
using vector boson fusion (VBF) processes at the LHC. We work in an effective
field theory framework with cutoff scale and ALP mass , and
assume that ALPs couple to photons with strength . Assuming
proton-proton collisions at TeV, we present the total VBF ALP
production cross sections, ALP decay widths and lifetimes, and relevant
kinematic distributions as a function of and . We consider the
decay mode to show that the requirement of an energetic
diphoton pair combined with two forward jets with large dijet mass and
pseudorapidity separation can significantly reduce the Standard Model
backgrounds, leading to a discovery reach for TeV with TeV, assuming an
integrated luminosity of 3000 fb. In particular, this extends the LHC
sensitivity to a previously unstudied region of the ALP parameter space.Comment: 9 pages, 5 figure
The Pixel Luminosity Telescope: a detector for luminosity measurement at CMS using silicon pixel sensors
International audienceThe Pixel Luminosity Telescope is a silicon pixel detector dedicated to luminosity measurement at the CMS experiment at the LHC. It is located approximately 1.75 m from the interaction point and arranged into 16 “telescopes”, with eight telescopes installed around the beam pipe at either end of the detector and each telescope composed of three individual silicon sensor planes. The per-bunch instantaneous luminosity is measured by counting events where all three planes in the telescope register a hit, using a special readout at the full LHC bunch-crossing rate of 40 MHz. The full pixel information is read out at a lower rate and can be used to determine calibrations, corrections, and systematic uncertainties for the online and offline measurements. This paper details the commissioning, operational history, and performance of the detector during Run 2 (2015–18) of the LHC, as well as preparations for Run 3, which will begin in 2022